Denver-based Boom Technology's XB-1 demonstrator plane hit Mach 1.122 — 750 mph. It's the first independently developed ...

Concorde was retired from service in 2003 ... The aircraft had faced declining passenger numbers following the Air France Flight 4590 crash in 2000, in which 109 people were killed shortly ...

The last commercial supersonic aircraft, Concorde, was retired in 2003 ... There were also safety concerns after the Air France Flight 4590 crash following a tire blowout on the runway at Paris ...

A deadly crash more than two decades ago hastened the jet’s demise. On July 25, 2000, an Air France Concorde crashed into a hotel and exploded shortly after takeoff in Paris, killing all 109 ...

The 1973 stock market crash and an oil crisis in the same year made airlines rather cautious about aircraft that consumed a lot of fuel. Reports suggested that Concorde achieved a per-passenger fuel ...

But the Concorde never went mainstream, due to challenging economics and its sonic booms that led it to be banned on many overland routes. Only 20 were built, 14 of which were used for passenger ...